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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7679174713ce0bd15c30062b2e27d6da9b93d70d23a50eb3befccfdaed32423' 
  AND token = 'n7+11NNNVJzgm3J+4IfzoWEGdTpoBVCs50QoHxeuNgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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