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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc931eabd6e9ea1f43145666dc472377e4a0e46cb9e18e7f8a65b71d7586536b' 
  AND token = '6i6mQuWLPtu93UL0/1JymuuQJwRTnbZe2aq8KyVaDd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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