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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd384c09f6de8cdeb97dcd511f77b130874acc740b506174f4e7a7bae69f97b' 
  AND token = 'tybu3R4sI0fDu6Zyn7PXXDDOvZf/DShwAi4KfyGKYR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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