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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6206d42e2a72a318fa4198136c4f0d2e162426e1a1d338ce4982c4b2e70bf3e3' 
  AND token = 'doOd6VPCX2CYtUHbm+CzJKpwJ5aHWz4BL991P0BsgUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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