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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983f084fa78d82d0da5e8dc63db1a0af964b80c42af543b0bacea885111930dc' 
  AND token = '+Kcn041XzJRIOYrvBRbvjI312o7B0ptsBna/4ByHuR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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