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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f7184e0a2e70099fb06eb0d3adda35b2e216e92405ce89a8f1816982274625' 
  AND token = 'CwyzzlWZM5Qkgd1YepFR4Fz5vBbxuHs61n37nToxfsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}