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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87966843d4b0a17acae72c7f10ee787acf260a98a5a30d6b16f37ed232fc4daa' 
  AND token = 'cAvP1Rv4YLRyDLoubaaj6NZ4Kj+NeZGIwF5Q2/th0Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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