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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986efd9205fac2f0dcefebe1194b3724ee76b3e289169fdf425ab5df3e18de5f' 
  AND token = 'pzB2FelnXQIXgekTivrO4x9h1A/060pI1/e7A1v+fow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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