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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ed3b0aa4d97acd5738110e21557931a4620f254aaf9b2e51cefcdceec2385c' 
  AND token = '/Y/vn4zV+Q15HhQE8jhbZ42Mw9QDX4Ll7A5gMPozI0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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