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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620954bc434f70cfefccbb2b77022c61fdc179f174738f7ae68a9dd1ce310004' 
  AND token = '5IRjFLPdg9B1yIAOEdy8/xP3Wk/UoR1YgEoZAVr8Jdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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