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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c6d0d0348bcc1b44cb3d4c2c798f0a6c4ec33112281e2180ea609fb07b0f8d' 
  AND token = 'oNnzB2/PM/TdVxg+ml/Snex44ZdC/w3IMv6KcPeIjQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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