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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c8372178569a233416b54ceaa79f0460d6eca1156e69948aacfd0ac24f0e6c' 
  AND token = '0o0nweFJXULUXBeJ9mdJyjSlSHibgNp3Bjvv0IuFTJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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