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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b669970197a8a8a07997f8a13d6f4f0602803c2df5df621f5b13dad21f91cfa' 
  AND token = 'SryvIbpEVXNeXT+VH5a1AJKwIg9Stfx450syOazQICo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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