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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0869ce88076716d0054ec3ca9ba983ca0e2481c87adf71e7609b068f26524e' 
  AND token = 'CuonRhpKlETkrVAuVQjUHVACJn2OLtkvqEESqV0k7Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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