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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6abf2109728e96938e15d335b502711e44ab6d25cb9c43fdeb9c69d0765c3240' 
  AND token = 'lN4TqvJprj3C1sw1xa+ijAI6Gvaz5w6j/OOs6AcG1t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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