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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476f2055b37b059c4d2efe2b9eb17fdabb3661fae5762d7071969c5e472e4ed6' 
  AND token = 'S05Rdtk7jhEz/Uv2kHtsOopYVUSHAQo8hrI61XvZ390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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