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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d1c9276c4f85009fc6e47056b7f838ce70435c8a1a2d7b555e01e92d82b18d' 
  AND token = 'UMHjzZouk+1CQs4UlYhrj2RcqfpGLHc8Dt8l+L1+644=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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