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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1081f26c985c1b8a806695167bd9b6250e9247ae8f17857ac3cf7801f436bde6' 
  AND token = 'Le3HdkFyRB5FM4Vgx3qNvfVhe2uf9gHNsandX7xplos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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