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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e410c5ef688b55bde9ada373f55e9a0350cd368ec8bd45ad328157dcddf6e809' 
  AND token = 'aVFs3f8Qf50+Y8nGivd5J32J291c+1eFPEXaeRA+wIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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