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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c307e8e07c196c36766ce5476d0b311c3eb1a2f42d74d20a51cac7adad6801b' 
  AND token = 'kAGFAULu/xG2HirsiM7pAwvZwhtd5/YSrQn2Fy03s08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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