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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00986103db8c110b4b93b9c4df248ce63be412fa00d925e3d8368d5148bc7ac7' 
  AND token = 'c2GbHPSH9c69Vu3+Be9ttBruW8aH4swdFCk5d532tXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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