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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11eabbbb82c11626dce0ff2b0d0c1f0e5759bd09b4d8ffc79ba6f893c77e855e' 
  AND token = 'CQLSAPWo/rLWbR1xjNRw97Q0u+SnJekWBEePzmN52SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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