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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58218842d85e43018dfbc751aec94668fa1cca256562924d1c5b20ae9a9ac5a' 
  AND token = 'yfeY6JVOQAY6I417bhBs2mVGj/s4uGcfvPiDsudkdhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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