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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee8e38b709f16e4d881a0c8d53c96dbd697f8de9af51f90bbf81983dfef970e' 
  AND token = '3SIOrINf782XiqN3jpX5/JmR/auvATPtSv/CwlQZllo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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