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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c928ec384fff56399c145e3e634db6890fd6401c671bcaa21f3ba04e20dd6f9' 
  AND token = 'Kghl2IFqOcWHOfWJ3hHxfVru9jV2p4eCCTqnrMY06HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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