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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eefce2ec24680c7b386aeb1173367ff2eb6bf9961faa6e251c6d50ae8028560c' 
  AND token = 'shJALFalejXg9nk8lMF93n76ZZtCLQfSizsiaUTvtns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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