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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bec4c74c536aa7052260e4bde689a9a9fb75dbaf233948f036734fa5a007a3' 
  AND token = 'Ltf+Ine7doa540Jn/X1bqa2lMx5wBoqSBXHTEmDxCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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