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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ece282d8bb3b7ad0cd8a99d5a8e96b0581da2a1506ca9f84248971475b4fa4' 
  AND token = 'eCceefZzVeWD70874dJvmi3APt2fS63MfyaOFm4NoxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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