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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950c2e0a41994998c586376cbbf3c0e66c9ce67420c4edd787bddbb96e09cdbc' 
  AND token = 'nXXw0J94QhRC95sd9KJrcBP0x7LpPiRXZNLLLsM7IOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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