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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789983a7621f101648438c5dc6557b4052c9163d75dae48bcb1fa28475a8ab7d' 
  AND token = 'M3jaAwN5C9jtTjuIpfCUrBNzV4sxbyXqjtAmAPoY16I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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