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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba61b42c8ffcf38e01405cc1be01324a845031e17acd08a4058fd8cc99596a1a' 
  AND token = '+Sqczchml6dDHukf86MhiXvS2Td7QNEcMHoxRrlM+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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