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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccde20b8bb44f6f4ca36d77d87dad46029ceea471ab160aff74d94ac4d33bf08' 
  AND token = '5SHMe2Upzl4F+g7rV2A2jrJeOenEaodbs2r9Jl+641w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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