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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5247b4d50eddafa3a4d75a1e20d517424635ebb293e16d9b156dc60503b053f2' 
  AND token = 'yCMHC7+29ehltmXBPMYrRpiY1Ni541X5CQgajRagksM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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