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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319188d0447b529eb23c0b0c4e954c531a5bfbeea382351832965abb3126d2e4' 
  AND token = '2dzOTFYA+dYkDK0aSNIrK+lvzeqfVPYfRU2G2DQia/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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