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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab8f0968f7bbeb94c4176fba5e96b64cebeed68c0a1aea36b1e43e5f06fe7b9' 
  AND token = 'q6Eboo2OBlB1YGsUeKwWtIS6fvr9kPIvArt+oo28yKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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