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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ad4a7786d9babfd56614dffff7d39354c1c007ae89cf741e57384f3563268e' 
  AND token = 'y6RKdL4jB0Wo7BLDWIA97pYf7jG15rXqomvJRM/oED4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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