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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896610ba4892ef7aabda5ea12846493b912ef1ca368e87f056f6768359ded7c8' 
  AND token = 'bKatMpGoMvdpTT8zF8R9nr/0m7+vPfxlpBNP4VtiDNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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