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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2cba0be3bb9824952cb4fc6e2ffc5f38adc98410943254d3f30cec5b28c501' 
  AND token = 'AszuQCJkM56+kypHLkHVGNvjppn+nBv7skNtP/Nnjf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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