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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae3275839fb0d97da30bebadf60ad4c98b9d391558e32b62e3aaaf203654aad' 
  AND token = 'rfEx8Ih/nG3DYQw3pkg05k4Vhfdd5FL10QYlH78gqTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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