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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ac8a209f9426ad54738d34ea699ad5877c4da5209c8d45ac17d31910b34228' 
  AND token = 'PQviIUf621m4lTfcJ+1AP9LiNtTmEjqy4U4TY3TNynI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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