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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6be61d13016faea793581bd65610fb17157afab0e11bc865d091a7756ad6f1c' 
  AND token = 'ihDfz2bXeX2D4L+IeQ+97eDVQC0qY+sjGHA7C4KwTHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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