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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0db0d0f9443ec81afb03d5b8bc1c3d6f743c2f7fe0f914e79a65dad4799ff5' 
  AND token = 'gy5Hq41FRhgt4W5S21oh+zBiOFqqGhegDX7y0xvcXko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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