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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ea7c75699057d06442ea7eb320af0e3e10e8eadf08d1bddc12834e87945462' 
  AND token = 'f4+0gMtl1kAaSgDn7e96Tg7EDq2VQVOIZqKibH1uzFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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