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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05e32e06930699de7c5e3ed8c48399ed634c8c39ef4ca5f59503ad1cd54ba29b' 
  AND token = 'uAU/jAUOgLw1U7G27B1MMPdG4aZSxe89gWKbfvOqmnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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