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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e872b612d9a568a485b4a0e4105e0d2fdea72a96594c70a1dcefcd40f098ca60' 
  AND token = 'OSGp11wHUP4tp2AEOW/HCpS1BOxLiPW3A27NKJW8J0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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