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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8b5503b27ee62de409e95c32b6151de059926a1b1a185724eed7a5d6a89c70' 
  AND token = '+hkpzBCdmK49rsCrFPB0lya4RLNqdaZwgn/lsAKjf4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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