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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65eae07bb9e4088bed986621d6ea8d0b1c0f20ce6d9d4c1ab42fbe7ac90df891' 
  AND token = 'KPkPMMUK3mLFyfWQJ7GNJW5HQhKoYLT/Z3120OSLWWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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