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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06897b06cee4028abdefc4df07537c2fbe9619d9361b15193dfbf6329ba433b0' 
  AND token = 'DEpJkL4SOZswcZDl44RzFCyklW7jICo84lH1l8pzpa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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